How many years corresponds with each rating?

for the average player that is.

sorry don't know how to edit on mobile, so double post to elaborate. I mean to say that I'm currently bouncing between 850-900 although I'm a bit above 900 right now. I have been playing chess for 6 months with no coach or prior experience. So my idea of an average player is someone like me, with no coaching just youtube videos and practising the chess.com tsctics

After about 1 year I reached 1150 for rapid. Hint, if you want to improve a lot, play 30 min games. They really help.

There is no answer. Even asking for an average is ridiculous. It all depends on your level of natural talent, how much you work, age, and whether you decide to invest in coaching and books. There's simply far too much variance from person to person to be able to judge such a thing.

This!

That is hard to say. I've seen people who play every week and do their tactics for 4 years. Roughly speaking, they should be about 1500 (serious) rating by then. However, average players don't last that long and they just stay stuck below that. So, if you mean average, you should reach 1300 to 1400 within 3 to 4 years and that's about it. It can go faster if you're talented and keep looking for challenging materials, but then you're above average.   

A guide to chess improvement is a place where you will not only learn how long it takes to get to let's say 1200, but it will serve as a guide to help you along with gaining rating in chess by explaining that there are five fundamentals in chess, and later helps you get better at those, as well as suggest other material to go over for each level bracket. I imagine as you read that book and practice those principles taught in those pages you will reach 1200 rating on chess.com easily. (I think 1200 on rapid or blitz is about 900 Fide or close, which is the rating where the book starts to guide you though your journey to reach higher level chess.)

A guide to chess improvement by Dan Heisman. I'd advise you to get it. I think it's the best beginner book out there.

I have been playing for 2.5 years now. I am eleven and I have achieved a rating of 1600 in blitz so idk. It is mostly about the time u dedicate to chess and if u have taken any lessons. I, myself, haven't taken any so I think I have a pretty good rating.

There is no such correspondence. If you have talent you can be 1800 by age 12. If you don't, you still will be 1200 at age 50. That's with hardly any real work, just playing. If you put a LOT of work into it, you can raise that by 600 or so--that is, an ordinary player who puts in a lot of work gets to 1800 and a talented player who puts in a lot of work gets to 2400. Not counting the world-class talents who work it like a full time job and get to 2600+. But the point is, talent is the real key.